docs: def export_roles(self):
          """
          Export the roles to one of the export types.
          """
          # prepare the report by removing unnecessary fields
          del self.report["state"]
          del self.report["stats"]
          for role in self.report["roles"]:
              del self.report["roles"][role]["state"]
  
              defaults_path = os.path.join(self.roles_path, role,
                                           "defaults", "main.yml")
              if os.path.exists(defaults_path):
                  defaults = self.report["roles"][role]["defaults"]
                  self.report["roles"][role]["defaults"] = \
                      utils.yaml_load("", defaults)
  
          Export(self.roles_path, self.report, self.config, self.options)